Danforth B.N., Eickwort G.C. (1997) The evolution of social behavior in the
augochlorine sweat bees (Hymenoptera: Halictidae) based on a phylogenetic
analysis of the genera, in: Crespi B.J., Choe J.C. (Eds.), The Evolution
of Social Behavior in Insects and Arachnids, Cambridge University Press,
Cambridge, pp. 270-292.

Packer L. (2006) Use of artificial arenas to predict social organization in
halictine bees: data for fourteen species from Chile, Insectes Soc.
53, 307-315 [CrossRef].

Packer L., Taylor J.S. (1997) How many hidden species are there? An
application of the phylogenetic species concept to genetic data for some
comparatively well known bee "species", Can. Entomol. 129, 587-594.

Timmermann K., Kuhlmann M. (2008) The biology of a Patellapis (s. str.) species
(Hymenoptera: Apoidea: Halictidae): sociality described for the first time
in this bee genus, Apidologie 39, 189-197 [CrossRef][EDP Sciences].